stratified charge engine

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strat·i·fied charge engine

An internal-combustion engine with a divided ignition cylinder that uses the ignition of rich fuel in a small chamber near the spark plug to improve the combustion of a very lean mixture throughout the rest of the cylinder.
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Whilst there, he worked on the design and development of the Triumph TR7 and TR8 range of sports cars before moving into research and working on stratified charge engines and vehicle structures within the Energy Conservation Vehicle Programme.